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          <h1 class="post-title" itemprop="name headline">redis删除bigKey</h1>
        

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        <p>string类型控制在10KB以内，hash、list、set、zset元素个数不要超过5000，拒绝bigKey<br><a id="more"></a></p>
<h2 id="jedis使用代码块"><a href="#jedis使用代码块" class="headerlink" title="jedis使用代码块"></a>jedis使用代码块</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">Jedis jedis = <span class="keyword">null</span>;</span><br><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">    jedis = jedisPool.getResource();</span><br><span class="line">    <span class="comment">// 具体的命令</span></span><br><span class="line">    jedis.executeCommand()</span><br><span class="line">&#125; <span class="keyword">catch</span> (Exception e) &#123;</span><br><span class="line">    logger.error(<span class="string">"op key &#123;&#125; error: "</span> + e.getMessage(), key, e);</span><br><span class="line">&#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">    <span class="comment">// 注意这里不是关闭连接，在JedisPool模式下，Jedis会被归还给资源池。</span></span><br><span class="line">    <span class="keyword">if</span> (jedis != <span class="keyword">null</span>) </span><br><span class="line">        jedis.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="删除bigKey"><a href="#删除bigKey" class="headerlink" title="删除bigKey"></a>删除bigKey</h2><blockquote>
<p>redis 4.0已经支持key的异步删除，欢迎使用</p>
</blockquote>
<ul>
<li>Hash删除: hscan + hdel</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">delBigHash</span><span class="params">(String host, <span class="keyword">int</span> port, String password, String bigHashKey)</span> </span>&#123;</span><br><span class="line">    Jedis jedis = <span class="keyword">new</span> Jedis(host, port);</span><br><span class="line">    <span class="keyword">if</span> (password != <span class="keyword">null</span> &amp;&amp; !<span class="string">""</span>.equals(password)) &#123;</span><br><span class="line">        jedis.auth(password);</span><br><span class="line">    &#125;</span><br><span class="line">    ScanParams scanParams = <span class="keyword">new</span> ScanParams().count(<span class="number">100</span>);</span><br><span class="line">    String cursor = <span class="string">"0"</span>;</span><br><span class="line">    <span class="keyword">do</span> &#123;</span><br><span class="line">        ScanResult&lt;Entry&lt;String, String&gt;&gt; scanResult = jedis.hscan(bigHashKey, cursor, scanParams);</span><br><span class="line">        List&lt;Entry&lt;String, String&gt;&gt; entryList = scanResult.getResult();</span><br><span class="line">        <span class="keyword">if</span> (entryList != <span class="keyword">null</span> &amp;&amp; !entryList.isEmpty()) &#123;</span><br><span class="line">            <span class="keyword">for</span> (Entry&lt;String, String&gt; entry : entryList) &#123;</span><br><span class="line">                jedis.hdel(bigHashKey, entry.getKey());</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        cursor = scanResult.getStringCursor();</span><br><span class="line">    &#125; <span class="keyword">while</span> (!<span class="string">"0"</span>.equals(cursor));</span><br><span class="line">    </span><br><span class="line">    <span class="comment">//删除bigkey</span></span><br><span class="line">    jedis.del(bigHashKey);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>List删除: ltrim</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">delBigList</span><span class="params">(String host, <span class="keyword">int</span> port, String password, String bigListKey)</span> </span>&#123;</span><br><span class="line">    Jedis jedis = <span class="keyword">new</span> Jedis(host, port);</span><br><span class="line">    <span class="keyword">if</span> (password != <span class="keyword">null</span> &amp;&amp; !<span class="string">""</span>.equals(password)) &#123;</span><br><span class="line">        jedis.auth(password);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">long</span> llen = jedis.llen(bigListKey);</span><br><span class="line">    <span class="keyword">int</span> counter = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">int</span> left = <span class="number">100</span>;</span><br><span class="line">    <span class="keyword">while</span> (counter &lt; llen) &#123;</span><br><span class="line">        <span class="comment">//每次从左侧截掉100个</span></span><br><span class="line">        jedis.ltrim(bigListKey, left, llen);</span><br><span class="line">        counter += left;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//最终删除key</span></span><br><span class="line">    jedis.del(bigListKey);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>Set删除: sscan + srem</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">delBigSet</span><span class="params">(String host, <span class="keyword">int</span> port, String password, String bigSetKey)</span> </span>&#123;</span><br><span class="line">    Jedis jedis = <span class="keyword">new</span> Jedis(host, port);</span><br><span class="line">    <span class="keyword">if</span> (password != <span class="keyword">null</span> &amp;&amp; !<span class="string">""</span>.equals(password)) &#123;</span><br><span class="line">        jedis.auth(password);</span><br><span class="line">    &#125;</span><br><span class="line">    ScanParams scanParams = <span class="keyword">new</span> ScanParams().count(<span class="number">100</span>);</span><br><span class="line">    String cursor = <span class="string">"0"</span>;</span><br><span class="line">    <span class="keyword">do</span> &#123;</span><br><span class="line">        ScanResult&lt;String&gt; scanResult = jedis.sscan(bigSetKey, cursor, scanParams);</span><br><span class="line">        List&lt;String&gt; memberList = scanResult.getResult();</span><br><span class="line">        <span class="keyword">if</span> (memberList != <span class="keyword">null</span> &amp;&amp; !memberList.isEmpty()) &#123;</span><br><span class="line">            <span class="keyword">for</span> (String member : memberList) &#123;</span><br><span class="line">                jedis.srem(bigSetKey, member);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        cursor = scanResult.getStringCursor();</span><br><span class="line">    &#125; <span class="keyword">while</span> (!<span class="string">"0"</span>.equals(cursor));</span><br><span class="line">    </span><br><span class="line">    <span class="comment">//删除bigkey</span></span><br><span class="line">    jedis.del(bigSetKey);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<ul>
<li>SortedSet删除: zscan + zrem</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">delBigZset</span><span class="params">(String host, <span class="keyword">int</span> port, String password, String bigZsetKey)</span> </span>&#123;</span><br><span class="line">    Jedis jedis = <span class="keyword">new</span> Jedis(host, port);</span><br><span class="line">    <span class="keyword">if</span> (password != <span class="keyword">null</span> &amp;&amp; !<span class="string">""</span>.equals(password)) &#123;</span><br><span class="line">        jedis.auth(password);</span><br><span class="line">    &#125;</span><br><span class="line">    ScanParams scanParams = <span class="keyword">new</span> ScanParams().count(<span class="number">100</span>);</span><br><span class="line">    String cursor = <span class="string">"0"</span>;</span><br><span class="line">    <span class="keyword">do</span> &#123;</span><br><span class="line">        ScanResult&lt;Tuple&gt; scanResult = jedis.zscan(bigZsetKey, cursor, scanParams);</span><br><span class="line">        List&lt;Tuple&gt; tupleList = scanResult.getResult();</span><br><span class="line">        <span class="keyword">if</span> (tupleList != <span class="keyword">null</span> &amp;&amp; !tupleList.isEmpty()) &#123;</span><br><span class="line">            <span class="keyword">for</span> (Tuple tuple : tupleList) &#123;</span><br><span class="line">                jedis.zrem(bigZsetKey, tuple.getElement());</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        cursor = scanResult.getStringCursor();</span><br><span class="line">    &#125; <span class="keyword">while</span> (!<span class="string">"0"</span>.equals(cursor));</span><br><span class="line">    </span><br><span class="line">    <span class="comment">//删除bigkey</span></span><br><span class="line">    jedis.del(bigZsetKey);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h2><ul>
<li><a href="http://blog.didispace.com/%E9%98%BF%E9%87%8C%E4%BA%91Redis%E5%BC%80%E5%8F%91%E8%A7%84%E8%8C%83/" target="_blank" rel="noopener">阿里云Redis开发规范</a></li>
<li><a href="http://blog.didispace.com/JedisPool%E8%B5%84%E6%BA%90%E6%B1%A0%E4%BC%98%E5%8C%96/" target="_blank" rel="noopener">JedisPool资源池优化</a></li>
<li><a href="http://blog.didispace.com/Jedis%E5%B8%B8%E8%A7%81%E5%BC%82%E5%B8%B8%E6%B1%87%E6%80%BB/" target="_blank" rel="noopener">Jedis常见异常汇总</a></li>
</ul>

      
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